I need someone crowded up behind me like I need a third nut. I avoid carrying passengers whenever it's practical to do so.

Yup,it cramps my style big time. I ride for the ride and having an extra 120 to 160 lbs on the back whilst dragging things in corners just doesnt appeal to me. Admittedly I live for corners.
If someone really wants to go for a ride and understands what riding on a bike is about I'll take them around some.

Ive ridden on the back a few times after my bike blew up and I had to get home,its terrifying and so much more fun to be the one driving. Most wives of friends end up getting their own bikes after playing passenger too much.
That's a whole nuther story though and gets complicated sometimes.